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Net Income Per Common Share: Schedule of Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Earnings Per Share, Basic [Abstract]                      
Net income to common shareholders                 $ 24,283 $ 27,118 $ 23,600
Denominator – weighted average common shares outstanding (shares)                 8,038,674 8,175,898 8,304,002
Basic net income per common share (in dollars per share) $ 0.80 $ 0.74 $ 0.71 $ 0.78 $ 0.82 $ 0.77 $ 0.81 $ 0.91 $ 3.02 $ 3.32 $ 2.84
Diluted net income per common share computation                      
Effect of dilutive stock options (shares)                 41,708 72,283 79,333
Weighted average common shares outstanding-assuming dilution (shares)                 8,080,382 8,248,181 8,383,335
Diluted net income per common share (in dollars per share) $ 0.79 $ 0.74 $ 0.70 $ 0.77 $ 0.81 $ 0.77 $ 0.80 $ 0.90 $ 3.01 $ 3.29 $ 2.82